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It seems a little unusual that a 2016 would have had it's OEM battery replaced already but that appears to be the case.
1. Is the OP the original owner of the vehicle? Do you know why or when the battery was replaced? None of the "install date" dots on the battery label have been removed.
2. A "Toyota TrueStart" battery was likely installed at a dealership. Can you log in to the the Toyota Owners Website at toyota.com and check for service records relating to the battery?
3. Is there something wrong with the charging system that it is overcharging and destroying batteries? The battery doesn't appear damaged in that way. Is there a pressure relief valve that would blow to the side of the battery?
4. Notice the amount of corrosion under the rear battery clamp. There almost had to be some acid present on the top of this battery (or a previous one) for an extended period of time to have that much corrosion. That didn't happen in just a couple days.
5. Is the battery cap nearest the positive terminal fully seated? It looks a little higher/different than the other one.
6. What does the underside of the hood look like? Is there a spray pattern that would provide further clues to the source? Was there something (other than battery acid) spraying on the hood and running off onto the battery?
I agree with Sapphireho and Tcoat: The stuff that is sprayed all over doesn't look or act like battery acid. It appears to be a little thicker than liquid acid and the wrong color.
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